seismic analysis of multistorey rc frame structure with .... 41-49.pdf · material used, wall...

IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org

ISSN (e): 2250-3021, ISSN (p): 2278-8719

PP 41-49

International Conference on Innovation & Research in Engineering, Science & Technology 41 | Page

(ICIREST-19)

Seismic Analysis of Multistorey RC frame structure with shear

wall effect and finding its optimal location

Palash Wanjari1, Indrayani Holkar

2, Aarti Bisen

3, Mrs.S.A.Manchalwar

4

1UG Student, Civil Engineering Department, Priyadarshini J.L.College of Engineering,Nagpur.



4Assistant Professor, Civil Engineering Department, Priyadarshini J.L.College of Engineering,Nagpur

Abstract- An earthquake is the shaking of the earth surface they are caused by sudden movement of the earth's

tectonic plates or seismic waves. Earthquake causes hazardous losses of life as well as structures. To overcome

this problem many researchers are focusing on designing the earthquake resistant structure. Shear walls are one

of the most commonly lateral load resisting mechanism used in high rise buildings. It has high strength which

can be used to simultaneously resist large horizontal loads and support gravity loads. Thus it is very necessary

to find out the optimum location of shear wall. Shear wall arrangement must be absolutely accurate, because if

not, it will cause deflection as well as many negative forces acting on a building. In this paper seismic analysis

of G+6 storey building is carried out in E-Tabs. Study carried for finding the effect of shear wall and choosing

it’s optimum location in a multistory building frame by changing locations. The responses of building frame are

determined with optimum location of shear wall using both Equivalent Static Method and Response spectrum

Analysis.

Keywords-- Shear Wall, Optimization, Seismic Forces, Concrete Structures.

I. Introduction Earthquake is Natural Disaster of Unpredictable Nature. An earthquake is the shaking of the earth

surface they are caused by sudden movement of the earth's tectonic plates or seismic waves.

Sudden release of the energy in the earth that creates seismic waves. The main cause of earthquake is

that when tectonic plate collide the one side over the other and in the seismic waves, earthquake is usually

caused when rock underground suddenly break along the fault. The sudden release of energy caused the seismic

waves that make the ground shake and this results in the formation of the earthquake. The effect of the

earthquake are surface faulting, tsunamis, soil liquefaction, land slide etc. Vibrations which are caused under

the earth’s surface generate waves which disturb the earth’s surface, termed as earthquakes. It was said that

earthquakes will not kill human but structures which are not constructed in considering the earthquake forces do.

60% of India lying in earthquake prone zone at which there is a need of increase of understanding the behaviour

of earthquake, constructing and developing earthquake resistant structures.

There are different methods or techniques if earthquake resisting building like levitating foundation ,

shock absorbance, base isolation , pendulum power , damping devices , bracing system and shear wall.

In structural engineering, a shear wall is a vertical element of seismic force resisting system that is

designed to resisting in plane lateral forces typically wind and seismic load shear wall is one of the lateral

resisting structure which is used commonly. Shear wall gives the high stiffness structures as the structure will be

stable. Applying the shear wall can effectively reduce displacement and storey drift of the structure. Shear walls

are used to resist the lateral forces produced during earthquake. Shear walls behaviour depends upon the

material used, wall thickness, wall length, wall positioning in building frame also.

Analysis of G+6 Storey building with and without shear wallis carried out and shear wall is modeled at

different part of the building to check the optimal location of shear wall to get the minimum reduced base shear

and the results are compared. For Analysis ETABS (Software tool) is used.

The main objective is to check and compare the seismic response of multi-storied building for different

location of shear wall, so that one can choose the best alternative for construction in earthquake-prone area.

Different location of shear wall in R.C.Building is modelled in E-TABS software and the results in terms of

storey displacement, storey drift, storey shear are compared.

II. Storey Parameters

Base (or) Storey shear

It is the maximum expected lateral force that will occur due to seismic ground motion at the base of structure.

Seismic Analysis of Multistorey RC frame structure with shear wall effect and finding …


(ICIREST-19)

Storey drift

Storey drift is the displacement of one level relative to the other level above or below it:

Storey drift ratio =Differance Between Displacement of Two storey

Height of One Storey

Storey Displacement

It is the total displacement of the storey with respect to ground.

Allowable displacement = Total Height of Building

500

For the study G+6 (7 STORY) of residential building is taken which having base dimension of plan

10*10 m2 with typical floor height of 3 m.The aim of design of building is to resist the building from earthquake

as well as the lateral forces.This plan of building is modeled in ETABS software where the shear wall is placed

at different locations. There are two model which has been analyzed one is with shear wall and another one is

without shear wall. The thickness of shear wall is 150 mm. The plinth height is 3 m above from foundation base.

Preliminary data:- 1. Density of concrete 25 kN/m3

2. Live load 3 kN/m3

3. No. Of storey G+6

4. Slab thickness 100 mm

5. Storey Height 3 m

6. Total height of building 21 m

7. Wall thickness 230 mm

8. Beam -1 in X-direction 230x500 mm

9. Beam -2 in Y-direction 230x400 mm

10. Column 1in T –junction 300x500 mm

11. Column 2 in L-junction 300x400 mm

12. Column 3 in centre 450x450 mm

Seismic data:- 1. Seismic zone V :- 0.36

2. Important factor :- 1.50

3. Response reduction :-2.25

0

Fig.1: Plan



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Table 1 LOAD CALCULATION (kN/m)

Load type Dead Load Live Load Total

Theorotical 3510.059 2100 5610.059

E-Tabs 3546.0649 2100 5646.0649

Design Seismic Base Shear (Vb)

Total load (W) = Dead load + 25% live load

Total load (W) = (1750 + 1086.75 + 677.512) + (0.25 x 2100)

Total load (W) = 4039.26 kN/m

Ah =Z

2

I

R

Sa

g (1)

Calculation of acceleration constant(Sa/g)

TIME PERIOD (Ta) = 0.075

= 0.075 x 210.75

Thus, Ta = 0.7357S

Fig.2: Elevation of Building Model in ETAB Software



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Zone factor for Zone V =0.36

Importance factor =1.5

Average Acceleration Coefficient = Sa

g = 1.84 (Medium Soil)

Design lateral force

Eqn (1) Becomes, Ah =0.36

2x

1.5

5x1.84

Therefore, Ah=0.093

Base shear (Vb ) = Ah xW

= 0.0993 x4093.23

𝐁𝐚𝐬𝐞 𝐒𝐡𝐞𝐚𝐫(𝐕𝐛) = 𝟒𝟎𝟏.𝟎𝟗 𝐤𝐍

Design Seismic Base Shear Vb & Software Validation

Table 2 Theorotical 401.8622 kN

E-Tabs 401.8622 kN

III. Result & Disscussion: After analyzing building without shear wall we compared it with different parameters providing shear

wall for its optimum location the results for different parameters are as follows , by comparing the results with

each other there is specific location for shear wall to resist the lateral forces acting on a structure.

Model 1 (Structure without shear wall)

1.1 Storey displacement plot of earthquake in x direction

Without shear wall by ESM



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1.2 Storey displacement plot of Response Spectrum Analysis in X direction

Without shear wall

Providing RC shear wall at extreme corners of the building of 150 mm thickness & analysed it by

ESM and RSM

Model 2



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2.1 Storey displacement plot of earthquake in x direction

2.2 Storey displacement plot of Response Spectrum Analysis in Y direction



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Providing RC shear wall at center of the building of 150mm thickness & analysed it by ESM and

RSM

Model No 3

3.1 Storey displacement plot of earthquake in X direction by ESM



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3.2Storey displacement plot of Response Spectrum Analysis in X direction

Table 3

Table 5

IV. Discussion: As above table 3, it is seen that displacement is less in structure with shear wall than in without shear wall.

As we change the position of shear wall in two ways. It is seen that Model 3(shear wall at centre)can resist

the seismic forces and lateral forces better than the model 2(shear wall at extreme).

So for better resisting property providing shear wall at centre.



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seismic analysis of multistorey rc frame structure with .... 41-49.pdf · material used, wall...

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